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Nirn- STATES PATENT einen..

DANIEL W. MARMON, OF INDIANAPOLIS, INDIANA, ASSIGrNORV TO THE NORDYKE & MARMON COMPANY, OF SAME PLACE.

RETURN-MR PU RIFIER.

sPEciFIoATIoN forming part of Letters Patent No. 513,123, dated January 23.1894- Application filed March 28,1893. SerialNo. 467,972. (No model.) y/

dianapolis,in the county of Marion and State' of Indiana,have invented certain new and use rulImprovements in Return-Air Puritiers, of which the following is a specification.

The object of my said invention is to thor-r' oughly separate the dust from the air, in a return air separating and purifying machine. Said invention consists,-generally speaking, in placing within such a machine a series of cloth tubes, into which the dust laden air must pass, and through the fabric of which the air must escape in its passage, leaving the dust within the tubes readv to be dis posed of by other means. u

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a central sectional view of a machine embodying my said invention; Fig. 2 a fragmentary horizontal sectional view looking downwardly from the dotted line 2 2 in Fig. S, showing a portion of the carrier in plan; Fig. 3 a detail sectional View as seen from the dotted line 3 3 in Figs. I and 4, and Fig. 4 a vertical sectional view on the dotted line 4 4 in Fig. 3.

In said drawings the portions marked A represent the frame-work and casing of a machine within which my invention is contained; B an exhaust fan therein; O a frame-work carrymg the cloth tubes which are the feature of my present invention, and D a carrier whereby the collected dust is drawn out of the machine.

This machine, except as hereinafter described, ls not of my present invention, and need not be described in detail. As will be seen by the arrows placed thereon, there is an air current continually passing through it,

which is occasioned by the draft into the eye of the fan caused by the revolution thereof. The air is discharged from the fan casing through an opening in the bottom of its lower side. This openingis adapted to be increased or diminished by a slide S, which is secured to the fan casing, and adapted to be moved over said opening to a greater or less degree, as desired.

The frame-Work O consists of top and bottom boards, which may or may not have light stays between them, and rest upon supporting strips a. These boards contain perforations, and within them are secured the cloth tubes T, which are open both at the bottom and the top. The dust laden air from the fan entering these tubes, and escaping through their sides, necessarily leaves the dust within, which, by a jarring device presently to be described,is then precipitated into the chainber beneath, whence it is drawn oif by the carrier or conveyer.

The carrier or conveyer consists of one or more cross-bars D running upon chains or belts D', which chains or belts run `over the vwheels W, and these bars have a series of Scrapers s set thereon, which are so positioned as to tend to draw the dust or fine material toward the center, While a single central one s is set at right angles with the direction of movement, and draws it out at a little opening at Q, whence it may be carried off as desired. The barsDrest upon strips a at their ends, and are thus supported in a level position. Upon these cross-bars I provide,'as a means of agitating the structure containing.

the cloth tubes, projections p, which engage with similar projections c on the under side of said structure. As these projections come together, the result is to raise the structure slightly, and as the projections on the crossbars pass, to let it drop, thus jarring and'dislodging the dust which has accumulated on the interior of the tubes. This is aided by the form of' the projections, which are inclined or rounding where they come together, and square or abrupt where they part, in passing, as shown. In order that the dustladen air shall not be driven into this chamber,l make the joint between the lower board IOD admission of material, passages leading thereing and separating machine, a hopper for adfrom for the passage of said material, an exhaust fan communicating with said passages, said passages and said fan being so arranged that the air after being used returns to the eyes of the fan to be usedover again,a structure set in the path of the blast from the fan consisting of a close top having perforations,

a bottom, cloth tubes extending from said bottom to said top and secured within saidperforations and into which the dust laden air will pass and through the fabric whereof it may be permitted to escape leaving the dust therein, a chamber below said structure, a conveyer within said chamber adapted to carry 0E the deposited dust, projections on the bottom of said structure, and projections also on said conveyer adapted to comein contact therewith and thus agitate or jar said structure, substantially as set forth.

2. The combination, in a return air purifymitting material, passages and receptacles for said material, an exhaust fan connected with said passages, a structure set in the path of the blast from said fan consisting of a perforated bottom and top with cloth tubes secured Within the perforations, the bottom being on a level with and practically forming part of the ioor A and connected to said door by a flexible or yielding but air-tight connection, means for agitating the structure, and means whereby the dust may be removed when deposited, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 25th day of March, A. D. 1893.

DANIEL W. MARMON. [L. s]

Witnesses:

CHESTER BRADFORD, JAMES A. WALSH. 

